Lens-grinding machinery



H. W. HILL.

LENS GRINDING MACHINERY. APPLICATION FILED JULY 26, 1920.

1,434,896, Patented Nov. 7, 1922.

2 SHEETSSHEET I.

INVENTOR HA RR)" W H ILL ATTORNEYS H. W. HILL. LENS GRINDING MACHINERY. APPLICATION FlLED JULY 26, I920.

1,434,896, Patented Nov. 7, 1922.

2 SHEETS-SHEET 2.

Fi J11 INVENTOR HARRY W HILL ATTORNEYS Fatented Nov. '3, 1922.

e at a ea a t HARRY VI. HILL, OF SOUTHBBIDG-E, IVIAS$ACHUSETTS, ASSIGNOR 'IO AI IIEEICAN OPTI- CAI 'GOIYCEPANY, OF SOUTI-IBRIDG-E, MASSACHUSETTS, A VOLUN TARY ASSOCIATION Application filed July 26,

To all w/wm it may concern Be it known that [,Hannr IV. H Lna c1t1- zen of the United States, residing at Southbridge, in the county of IVorcester and State of lVlassachusetts have invented certain new and useful Improvements 1n Lens-Grinding vivllachinery, of which the followin is a speciiication. Y

tion of machine for use in the grinding or polishing of spherical surfaces, and particul arly adaptable foruse in connection with the formation of bifocal lenses from a single piece of glass.

The principal objectof the present inrention the provision of a novel and improved construction of machine in which the several.

parts shall be rigidly connected or associated readily accurately positioned to operate exactly tobut not extend at all over the dividing line between the readin and distance portions. '7 1 b Other objects and advantages of my improved construction should be readily apparent'by reference to the following specification taken in connection with the accompanying drawings, and it will be understood that I may make any modifications in the specific details of construction shown and described within the scope of the appended claims without departing from or exceeding the spirit of my invention.

Figure I represents a side elevation with parts in section of a machine embodying my improvements.

Figure II represents a side elevation with one of the tool holding arms in raised position.

Figure III represents a plan view of the structure as shown in Figure I.

v Figure IV represents a detail view of the adjustable tool enga 'ing arm.

In the drawings t e numeral 1 designates LENS-GRINDING MACHINERY.

1920. Serial N0. 399,049.-

the main bed or frame having ournaleil therein the lower spindle 2 driven as through thepul'ley 3 and bearin g at its-upper end the Said lens as illustratet is intended to be of bifocal form, that is, having an outer or major portion and a central or reading portion dwhichmay either join'each other in a merged line of joinder, or 111 a chfl' with the parts of unequal height as mayv be preferred, my machine being equally adaptable for the construction of either of these difficult to manufacture types of lenses, as well being entirely practicable for use in connection with the formation of plain spherical surfaces. v

Rising from the bcdl is the supplemental frame member 7 having pivoted at the top thereofthe link 8 which in turn has pivoted to it the tool arm 9 provided with the angularly adjustable head 10 having hearings on the spindle 11 of the tool 12shown as positioned to grind the outer or distance portion'of the lens. Thein and out position of the tool may be suitably adjusted as through rotation of the adjustin screw 13 which intermediately engages the link 8.

Supplementing the action of the arm 9 and tool carried thereby are a pair of arms let pivoted to the frame '7 preferably slightly in advance of the pointy of pivotance of the link ,8, said arms extending forwardbut spanning the arm 9 and terminating at their forward ends in the rearwardly curving cross piece member 15 provided atone end with the pivot receiving aperture 16 and at the opposite end with the slot 17.

A tool engaging arm 18 is pivoted atone end as at 16 and is intermediately provided. with. a depending pin 19 adapted to engage the tool 20, while at its opposite end it is provided with the boss 21. through which passes the adjusting screw 22. This screw screws into the boss or lug 23 on the arm 14: and has a head portion 2% bearin againstthe front of the arm 18, while mounted rearwardly thereon between the boss and arm is a spring 1 1 its edge coming just to the line of joinder between the reading anddistance portions of lens holder 4 forthe lens or glass disc 5 to be operated upon.

were the cross bar that'the arms may be as tool v.

to i the vscrew securely clamping the parts 5 and 18 together against any relative pivotal or slidmg movement.

I would call particular attention to the inwardly arcing form of the members '15 and 18, in that they on acwnnt of this shape aii'ord a bet r view Off the work and facilitate more s tCtOly- "adjustment oi the tools 12' and fZOrthanwonldbe the case 'ht tending to interfere with the view either around or thereover of the tool 12. i w

I also would call attention to .the fact that the space between the arms in is such ungupwa'rd" as tl're pin 19. from the and may be locked in raised position as the latch. member :27, as is illustrated in hip ire ll, or the arnr 9 may be raised without reference arms let, when desired suitable weights 28 c'ting throng 1. flexible --connections 29 serving to' holdeach oi the arms separatelyand independently down toward desired to. disenga I hen desned the worlr during the grinding or polishing It will be seen that either the operation. reading or distance portion, or both, be ground by my improved machine and oithersurface independently inspected and the operation stopped. atany' desired point without interfering "with the nse of the other tool, and 1n this way lean cpnte satisfactorily produce atwo part merged surface bifocal lens with my machine without the necessity of separately performing the several operations and changing the lens i'roin one machine to the other, ashas hithbeen necessary in the production of lenses ofthis type. I I 5 It will also be understood that by properly relating .:the weights 128 on the two arms "theyinay be caused to work'down into the glass at su astantially even rate of speed so as not to disturb the relationship of the two surfaces one to the otherr l spindle, a spindle carried by the bearing tion.

arm. and a second arm in the form oi a yoke carried by the frame and spannicng the last mentioned spindle, said second arm being held against movement relative to the frame, a second lap engaging spindle carried by said arm and adjustable connections between the arm and spindle to vary the in and out position oi the spindle with respect to its arm.

In a machine for grinding bifocal lenses, the combination with a tiiranie, ot a lens bearing spindle rotatably mounted in the frame, an arm pivotally connected to the frame and bearing; a lap engaging spindle, and a second arm pivotally connected to the frame adjacent the'point of attalchmentcf the lirst'and spanning said first arm, said second arm also bearing a. lap engaging spindle whereby either of said arms may be swnn out of engagement iwlth th lens without disturbing theother.

3. ln" a machine tor grinding bifocal lenses, the" combination with frame, of a lens bearing; spindle rotatably mounted in the frame, an arm carried by the frame and bearing a lap engaging spindle, and

second arm carried by the liranie adjacent the point of attachment of the first and spanning said first arm, said second arm also bearing; a lap engaging spindle, means for bodily'moving'oneoi thearins to vary the position of the spindle carried thereby, and means for shiftingithe other lap en- "ng spindle withrespect to its arm.v

1 machine of the character described,

the combination with a lens bearing spindle,

In testimony signature, in presence 0 witnesses leaner w. HILL.

Witnesses Esrnnn M, Lornnn, Anion G.- HASKELL.

'e ailixed my 

